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hugetlb/cgroup: migrate hugetlb cgroup info from oldpage to new page during migration 

With HugeTLB pages, hugetlb cgroup is uncharged in compound page
destructor.  Since we are holding a hugepage reference, we can be sure
that old page won't get uncharged till the last put_page().

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: David Rientjes <rientjes@google.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Aneesh Kumar K.V 2012-07-31 16:42:27 -07:00 committed by Linus Torvalds
parent abb8206cb0
commit 8e6ac7fab3
3 changed files with 33 additions and 0 deletions
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8
include/linux/hugetlb_cgroup.h
View File

@ -63,6 +63,8 @@ extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg);
extern int hugetlb_cgroup_file_init(int idx) __init;
extern void hugetlb_cgroup_migrate(struct page *oldhpage,
struct page *newhpage);
#else
static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
@ -114,5 +116,11 @@ static inline int __init hugetlb_cgroup_file_init(int idx)
return 0;
}
static inline void hugetlb_cgroup_migrate(struct page *oldhpage,
struct page *newhpage)
{
return;
}
#endif /* CONFIG_MEM_RES_CTLR_HUGETLB */
#endif

20
mm/hugetlb_cgroup.c
View File

@ -386,6 +386,26 @@ int __init hugetlb_cgroup_file_init(int idx)
return 0;
}
void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
{
struct hugetlb_cgroup *h_cg;
if (hugetlb_cgroup_disabled())
return;
VM_BUG_ON(!PageHuge(oldhpage));
spin_lock(&hugetlb_lock);
h_cg = hugetlb_cgroup_from_page(oldhpage);
set_hugetlb_cgroup(oldhpage, NULL);
cgroup_exclude_rmdir(&h_cg->css);
/* move the h_cg details to new cgroup */
set_hugetlb_cgroup(newhpage, h_cg);
spin_unlock(&hugetlb_lock);
cgroup_release_and_wakeup_rmdir(&h_cg->css);
return;
}
struct cgroup_subsys hugetlb_subsys = {
.name = "hugetlb",
.create = hugetlb_cgroup_create,

5
mm/migrate.c
View File

@ -33,6 +33,7 @@
#include <linux/memcontrol.h>
#include <linux/syscalls.h>
#include <linux/hugetlb.h>
#include <linux/hugetlb_cgroup.h>
#include <linux/gfp.h>
#include <asm/tlbflush.h>
@ -931,6 +932,10 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
if (anon_vma)
put_anon_vma(anon_vma);
if (!rc)
hugetlb_cgroup_migrate(hpage, new_hpage);
unlock_page(hpage);
out:
put_page(new_hpage);